scheduled tasks
Scheduling a task will eable us to execute an application at a predetermined time.
A- Scheduling a task
Step 1 - Opening the task scheduler
To do this, 
then Control Panel then Scheduled Tasks
Once there, just on Add Scheduled Tasks
This opens up a wizard, on Next and then Browse for your ShutdownPC file.
Step 2 - Scheduling the task
The task scheduler gives you several frequency and time options. In the illustration above, OFFICE/Joe represent the name I gave to my computer (OFFICE), and Joe is of course the user name.
B - Canceling the scheduled shutdown
First the scheduled task
Go back to the Scheduled Tasks window. Select the "ShutdownPC" task and then click on Cancel
Now the net user command
Once again open the ms-dos cmd.exe window, and type the following:
net user joe /times:all
then push Enter on your keyboard.